Portrait lens to complete my transition to A6000

I just recently converted from the Nikon D7000 and purchased the A6000, along with the following lenses:

Touit 12 (couldn't pass up the deal)

Touit 32 (same)

Sony 50

Zeiss 16-70 (my walk-around, Europe-trip lens)

Sony 55-210

I feel like I am pretty much set with that, but I'd like to get a a nice long telephoto for headshots of the kids, something along the lines of Nikon 85 1.4, which I used much more often than the 70-200. My kids are 1 and 3, and taking their portraits is becoming the bulk of my photography.

If I was made of money, or made money with photography, I'd grab the SAL 85 1.4 or the SAL 135 1.8 and be all set, but after spending over $1800 on the other 5 lenses, I'm getting close to my limit.

So is there a good A-mount that would be a significant step up from 55-210 in image quality? Ideally, I'd like to stay under $1000 total, and am willing to buy used as well. Or am I better off grabbing the 70-200 f4 full-frame from Sony Rewards, or maybe even just waiting for Sony to release an 85mm e-mount, and not have to purchase the LA-EA2 or LA-EA4?